1. 沉思;深思;仔细考虑
    If you meditate on something, you think about it very carefully and deeply for a long time.

    e.g. He meditated on the problem...
           他仔细斟酌着这个问题。
    e.g. On the day her son began school, she meditated on the uncertainties of his future.
           儿子开始上学的那一天，她就在考虑他未来的种种不确定因素了。

2. （宗教中）冥想，默想，打坐
    If you meditate you remain in a silent and calm state for a period of time, as part of a religious training or so that you are more able to deal with the problems and difficulties of everyday life.

meditate的反义词

    e.g. I was meditating, and reached a higher state of consciousness.
           我在冥想，并进入了一个更高的意识境界。